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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2019
Mar. 31, 2019
Apr. 02, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Interest-bearing funds deposited in other banks     $ 1,500,000                
Non-marketable securities     9,746,000 $ 10,079,000              
Net premium on investment securities [1]         $ 3,287,000            
Investment securities Amortized to interest income $ 21,000 $ 80,000 291,000 79,000              
Net loan origination costs     20,684,000 17,839,000              
Net amortization to income     6,021,000 4,952,000 3,128,000            
Premiums in loan portfolio     $ 40,541,000 60,413,000              
Percentage of write down of loan balance     40.00%                
Loans pledged as collateral     $ 15,367,000 28,833,000              
Principal portion of loans serviced, fair value     107,131,000 113,581,000              
Loans write down to collateral value     $ 75,844,000 49,961,000              
Intangible assets useful life     20 years                
Goodwill     $ 150,803,000 150,803,000              
Intangible assets, net     51,090,000 52,536,000              
Amortization of intangible assets     1,445,000 1,446,000 1,083,000 [1]            
Financing receivable, recorded investment, 90 days past due and still accruing     0 0              
Depreciation and amortization     412,000 418,000 422,000            
Amortization expense     2,558,000 2,348,000 $ 1,864,000            
Deferred costs     $ 5,805,000 $ 5,105,000              
Potential dilutive common shares excluded from EPS computation     934,003 462,180 100,000            
Stock based compensation award     444,557 449,450 39,000            
Stock based compensation award, Amount     $ 2,030,000 $ 1,221,000 $ 576,000            
Stock based compensation award per diluted common share     $ 0.08 $ 0.05 $ 0.02            
Unrecognized compensation cost related to unvested stock options and restricted stock     $ 2,405,000                
Unrecognized compensation cost related to unvested stock options and restricted stock, recognition period     48 months                
Tier 1 leverage capital ratio     16.93%                
Capital conversation buffer       2.50% 2.50%            
Restricted Shares [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Stock based compensation award     229,408 216,148 101,010            
Restricted Stock Units [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Stock based compensation award     47,156 26,040 0            
Medallion [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Premiums in loan portfolio     $ 4,282,000 $ 17,181,000              
Loans write down to collateral value     49,361,000 22,205,000              
Financing receivable, recorded investment, 90 days past due and still accruing     0 0              
New York City [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Loans write down to collateral value     79,500,000                
New York City [Member] | Medallion [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Loans write down to collateral value     46,087,000                
91+ [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Premiums in loan portfolio     6,878,000 8,663,000              
91+ [Member] | Medallion [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Premiums in loan portfolio     1,290,000 2,572,000              
91+ [Member] | Loans [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Premiums in loan portfolio     $ 6,878,000 $ 8,663,000              
Total loans more than 90 days past due ,percentage     0.57% 0.76%              
Medallion Bank [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Appreciation in Investment in Medallion Bank $ 39,826,000               $ 7,849,000 $ 128,918,000 $ 15,500,000
Net amortization to income         $ 3,993,000            
Amortization of intangible assets     $ 0 $ 0              
RPAC [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Premiums in loan portfolio               $ 12,387,000      
Financing receivable, recorded investment, 90 days past due and still accruing     2,717,000 5,758,000              
Loan portfolio premium amortized to interest income     3,041,000 3,289,000 $ 3,339,000            
Bank Holding Company Accounting [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net premium on investment securities     $ 278,000 $ 248,000              
Private Placement [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Interest reserve           $ 2,970,000 $ 2,970,000        
Minimum [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Interest bearing loan term     4 years                
Estimated useful life of fixed assets     3 years                
Tier 1 leverage capital to total assets ratio     15.00%                
Maximum [Member]                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Interest bearing loan term     7 years                
Estimated useful life of fixed assets     10 years                
[1] Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.